gecko-dev/layout/style/CSSFontFaceRule.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/dom/CSSFontFaceRule.h"

#include "mozilla/dom/CSSFontFaceRuleBinding.h"
#include "mozilla/dom/CSSStyleDeclarationBinding.h"
#include "mozilla/ServoBindings.h"
#include "nsCSSProps.h"

using namespace mozilla;
using namespace mozilla::dom;

// -------------------------------------------
// CSSFontFaceRuleDecl and related routines
//

// QueryInterface implementation for CSSFontFaceRuleDecl
NS_INTERFACE_MAP_BEGIN(CSSFontFaceRuleDecl)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsICSSDeclaration)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  // We forward the cycle collection interfaces to ContainingRule(), which is
  // never null (in fact, we're part of that object!)
  if (aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ||
      aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant))) {
    return ContainingRule()->QueryInterface(aIID, aInstancePtr);
  } else
NS_INTERFACE_MAP_END

NS_IMPL_ADDREF_USING_AGGREGATOR(CSSFontFaceRuleDecl, ContainingRule())
NS_IMPL_RELEASE_USING_AGGREGATOR(CSSFontFaceRuleDecl, ContainingRule())

// helper for string GetPropertyValue and RemovePropertyValue
void CSSFontFaceRuleDecl::GetPropertyValue(nsCSSFontDesc aFontDescID,
                                           nsACString& aResult) const {
  MOZ_ASSERT(aResult.IsEmpty());
  Servo_FontFaceRule_GetDescriptorCssText(mRawRule, aFontDescID, &aResult);
}

void CSSFontFaceRuleDecl::GetCssText(nsACString& aCssText) {
  MOZ_ASSERT(aCssText.IsEmpty());
  Servo_FontFaceRule_GetDeclCssText(mRawRule, &aCssText);
}

void CSSFontFaceRuleDecl::SetCssText(const nsACString& aCssText,
                                     nsIPrincipal* aSubjectPrincipal,
                                     ErrorResult& aRv) {
  if (ContainingRule()->IsReadOnly()) {
    return;
  }
  // bug 443978
  aRv.ThrowNotSupportedError(
      "Can't set cssText on CSSFontFaceRule declarations");
}

NS_IMETHODIMP
CSSFontFaceRuleDecl::GetPropertyValue(const nsACString& aPropName,
                                      nsACString& aResult) {
  aResult.Truncate();
  nsCSSFontDesc descID = nsCSSProps::LookupFontDesc(aPropName);
  if (descID != eCSSFontDesc_UNKNOWN) {
    GetPropertyValue(descID, aResult);
  }
  return NS_OK;
}

void CSSFontFaceRuleDecl::RemoveProperty(const nsACString& aPropName,
                                         nsACString& aResult,
                                         ErrorResult& aRv) {
  nsCSSFontDesc descID = nsCSSProps::LookupFontDesc(aPropName);
  NS_ASSERTION(descID >= eCSSFontDesc_UNKNOWN && descID < eCSSFontDesc_COUNT,
               "LookupFontDesc returned value out of range");

  if (ContainingRule()->IsReadOnly()) {
    return;
  }

  aResult.Truncate();
  if (descID != eCSSFontDesc_UNKNOWN) {
    GetPropertyValue(descID, aResult);
    Servo_FontFaceRule_ResetDescriptor(mRawRule, descID);
  }
}

void CSSFontFaceRuleDecl::GetPropertyPriority(const nsACString& aPropName,
                                              nsACString& aResult) {
  // font descriptors do not have priorities at present
  aResult.Truncate();
}

void CSSFontFaceRuleDecl::SetProperty(const nsACString& aPropName,
                                      const nsACString& aValue,
                                      const nsACString& aPriority,
                                      nsIPrincipal* aSubjectPrincipal,
                                      ErrorResult& aRv) {
  // FIXME(heycam): If we are changing unicode-range, then a FontFace object
  // representing this rule must have its mUnicodeRange value invalidated.

  if (ContainingRule()->IsReadOnly()) {
    return;
  }

  // bug 443978
  aRv.ThrowNotSupportedError(
      "Can't set properties on CSSFontFaceRule declarations");
}

uint32_t CSSFontFaceRuleDecl::Length() {
  return Servo_FontFaceRule_Length(mRawRule);
}

void CSSFontFaceRuleDecl::IndexedGetter(uint32_t aIndex, bool& aFound,
                                        nsACString& aResult) {
  nsCSSFontDesc id = Servo_FontFaceRule_IndexGetter(mRawRule, aIndex);
  if (id != eCSSFontDesc_UNKNOWN) {
    aFound = true;
    aResult.Assign(nsCSSProps::GetStringValue(id));
  } else {
    aFound = false;
  }
}

css::Rule* CSSFontFaceRuleDecl::GetParentRule() { return ContainingRule(); }

nsINode* CSSFontFaceRuleDecl::GetAssociatedNode() const {
  return ContainingRule()->GetAssociatedDocumentOrShadowRoot();
}

nsISupports* CSSFontFaceRuleDecl::GetParentObject() const {
  return ContainingRule()->GetParentObject();
}

JSObject* CSSFontFaceRuleDecl::WrapObject(JSContext* cx,
                                          JS::Handle<JSObject*> aGivenProto) {
  // If this changes to use a different type, remove the 'concrete'
  // annotation from CSSStyleDeclaration.
  return CSSStyleDeclaration_Binding::Wrap(cx, this, aGivenProto);
}

// -------------------------------------------
// CSSFontFaceRule
//

NS_IMPL_CYCLE_COLLECTION_CLASS(CSSFontFaceRule)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(CSSFontFaceRule,
                                               mozilla::css::Rule)
  // Keep this in sync with IsCCLeaf.

  // Trace the wrapper for our declaration.  This just expands out
  // NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER which we can't use
  // directly because the wrapper is on the declaration, not on us.
  tmp->mDecl.TraceWrapper(aCallbacks, aClosure);
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSFontFaceRule)
  // Keep this in sync with IsCCLeaf.

  // Unlink the wrapper for our declaration.
  //
  // Note that this has to happen before unlinking css::Rule.
  tmp->UnlinkDeclarationWrapper(tmp->mDecl);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(mozilla::css::Rule)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSFontFaceRule,
                                                  mozilla::css::Rule)
  // Keep this in sync with IsCCLeaf.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

bool CSSFontFaceRule::IsCCLeaf() const {
  if (!Rule::IsCCLeaf()) {
    return false;
  }

  return !mDecl.PreservingWrapper();
}

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(CSSFontFaceRule,
                                               mozilla::css::Rule)

#ifdef DEBUG
void CSSFontFaceRule::List(FILE* out, int32_t aIndent) const {
  nsAutoCString str;
  for (int32_t i = 0; i < aIndent; i++) {
    str.AppendLiteral("  ");
  }
  Servo_FontFaceRule_Debug(Raw(), &str);
  fprintf_stderr(out, "%s\n", str.get());
}
#endif

uint16_t CSSFontFaceRule::Type() const {
  return CSSRule_Binding::FONT_FACE_RULE;
}

void CSSFontFaceRule::GetCssText(nsACString& aCssText) const {
  aCssText.Truncate();
  Servo_FontFaceRule_GetCssText(Raw(), &aCssText);
}

nsICSSDeclaration* CSSFontFaceRule::Style() { return &mDecl; }

/* virtual */
size_t CSSFontFaceRule::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
  return aMallocSizeOf(this);
}

/* virtual */
JSObject* CSSFontFaceRule::WrapObject(JSContext* aCx,
                                      JS::Handle<JSObject*> aGivenProto) {
  return CSSFontFaceRule_Binding::Wrap(aCx, this, aGivenProto);
}